RT Journal Article SR Electronic T1 Gastroenterology JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 803 OP 803 VO 23 IS 136 A1 H. W. K. Acheson YR 1973 UL http://bjgp.org/content/23/136/803.1.abstract AB